[Lldb-commits] [lldb] [lldb] Fix deadlock in parallel module loading with separate symbol thread pool (PR #160225)

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Mon Sep 22 20:56:14 PDT 2025


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- lldb/include/lldb/Core/Debugger.h lldb/source/Core/Debugger.cpp lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp
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in a stack if you are using a stacked PR workflow. You can limit the results by
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View the diff from clang-format here.
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``````````diff
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index 964674878..9e662d5b6 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -716,7 +716,8 @@ void Debugger::Initialize(LoadPluginCallbackType load_plugin_callback) {
   g_debugger_list_mutex_ptr = new std::recursive_mutex();
   g_debugger_list_ptr = new DebuggerList();
   g_thread_pool = new llvm::DefaultThreadPool(llvm::optimal_concurrency());
-  g_symbol_thread_pool = new llvm::DefaultThreadPool(llvm::optimal_concurrency());
+  g_symbol_thread_pool =
+      new llvm::DefaultThreadPool(llvm::optimal_concurrency());
   g_load_plugin_callback = load_plugin_callback;
 }
 
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp b/lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp
index ae6529f9e..27298be68 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/ManualDWARFIndex.cpp
@@ -90,7 +90,7 @@ void ManualDWARFIndex::Index() {
   // Share one thread pool across operations to avoid the overhead of
   // recreating the threads.
   llvm::ThreadPoolTaskGroup task_group(Debugger::GetSymbolThreadPool());
-  const size_t num_threads = 
+  const size_t num_threads =
       Debugger::GetSymbolThreadPool().getMaxConcurrency();
 
   // Run a function for each compile unit in parallel using as many threads as

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https://github.com/llvm/llvm-project/pull/160225


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